51 lines
1.4 KiB
Go
51 lines
1.4 KiB
Go
// Copyright 2019 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package math
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import (
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"math/rand"
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"strconv"
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestStrLenOfUint64Fast(t *testing.T) {
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t.Run("RandomInput", func(t *testing.T) {
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for i := 0; i < 1000000; i++ {
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num := rand.Uint64()
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expected := len(strconv.FormatUint(num, 10))
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actual := StrLenOfUint64Fast(num)
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require.Equal(t, expected, actual)
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}
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})
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t.Run("ManualInput", func(t *testing.T) {
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nums := [22]uint64{0,
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1, 12, 123, 1234, 12345,
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123456, 1234567, 12345678, 123456789, 1234567890,
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1234567891, 12345678912, 123456789123, 1234567891234, 12345678912345,
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123456789123456, 1234567891234567, 12345678912345678, 123456789123456789,
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123456789123457890,
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^uint64(0),
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}
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for _, num := range nums {
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expected := len(strconv.FormatUint(num, 10))
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actual := StrLenOfUint64Fast(num)
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require.Equal(t, expected, actual)
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}
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})
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}
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